Instructions

Step 1 Preheat oven to 275°F (140°C).

Step 2 Line baking sheet with parchment paper or spray with cooking spray.

Step 3 Beat egg whites in large bowl with electric mixer until frothy. Add cream of tartar and beat until soft peaks form. Gradually beat in sugar, 1 to 2 tbsp (15 to 30 mL) at a time, until sugar is dissolved and stiff glossy peaks form. Beat in vanilla.